Google this:
5.1 using fundamental identities Comcast
Click and open the first result that appears on your search (Result= PDF Document). Textbook pages will appear and go to page 383 on problem #129. The directions will mention "Solve the right triangle shown in the figure."
b=6.2, c=12.54, C=90°, a=?, A=?, B=?
(Note: This problem is a good overview example of what you would generally expect on an exam & it's an awesome trigonometric/geometric question!)
Good grief 'awesome guy' !!
After all that , it simply asks you solve a very standard right-angled triangle.
Surely you must, absolutely must know how to to that!